Coil section spacer



0. H- BEYMER COIL SECTION SPACER April 19, 1949.

Filed Oct. 10, 1946 Inventor: OHveT H. Beymer;

His AttCrney.

ers between the sections.

Patented Apr. 19, 1949 COIL SECTION SPACER Oliver H. Beymer, Pittsfield, Mass, assignor to General Electric Company, a corporation of New York Application October 10, 1946, Serial No. 702,414

2 Claims. 1

This invention relates to stationary induction apparatus, such as transformers and reactors, and more particularly to improvements in spacers for sections of the windings of such apparatus.

Many transformer windings consist of a plu rality of serially connected, axially displaced, concentric sections. Each of the sections comprises one or more conductor turns and in order to maintain the proper separation of the sections against accidental mechanical displacement or displacement caused by electromagneti forces in the apparatus, it is customary to insert spac- However, the spacers must not entirely fill the space between adjacent sections because for proper cooling, it is usually necessary to leave as much free space as possible between adjacent sections.

Usually the circumferential spacing of the individual coil spacers is limited by the mechanical strength of the conductor which forms the coil sections and as the sections usually have substantial dimensions in the radial direction, and as the spacers usually extend radially between the sections, the greatest length of the unsupported conductor is at the outside of the sections. This means that the circumferential separation of adjacent spacers at the inner edge of the coil sections is substantially less than at the outer edge of the coil sections. sirable to bring out taps from the winding and in order to provide good support for the tap leads and in order that they not increase unduly the size of the coil structure, it is often desirable to bring these leads out of the winding between the inner edge of the coil sections and the insulating cylinder on which the winding is mounted. However, the outer circumferential separation of the coil spacers, which is dictated by the strength of the conductor forming the coil sections, i often such that the inner separation of the coil spacers is insufilcient to accommodate the tap leads.

In accordance with this invention, there is provided a novel and simple coil spacer which permits the inner and outer separation of adjacent ones to be equal.

An object of the invention is to provide a new and improved coil spacer for electrical windings.

Another object of the invention is to provide a simple and inexpensive coil spacer which permits increasing the separation of adjacent; spacers at the inner periphery of the coil without requiring an increase in the separation of those spacers at the outer periphery of the coil.

The invention will be better understood from Frequently, it is dethe following description taken in connection with the accompanying drawing and its scope will be pointed out in the appended claims.

In the drawing, Fig. 1 is a side elevation View of part of an induction apparatus embodying my invention; Fig. 2 is a sectional View taken on line ll of Fig. 1, and Fig. 3 is a view similar to Fig. 2 showing how conventional coil spacers would have to be arranged in order to provide the same separation at the inner periphery of the coil that is achieved by my new coil spacers shown in Fig. 2.

Referring now to the drawing and more .particularly to Fig. 1, there is shown therein an electrical winding comprising a plurality of coil sections l, 2, 3, 4, and 5. These are mounted on an insulating cylinder 6 in the conventional manner and this cylinder surrounds a winding leg 'I of a magnetic core which is shown schematlc-ally in the drawing. The coil sections are separated from each other by conventional spacers 8 and, by novel spacers 9 which are retained in place by being keyed to insulating rods l0 which are on the surface of the cylinder 6 and which run parallel with its axis. The spacers may be cut out of pressboard in any suitable manner, or molded out of any suitable insulating material.

In the space bounded by my improved coil spacers 9, the outer surface of the cylinder 6 and the inner periphery of the winding, are a plurality of conductors II which may, for example, be tap leads which are being brought out from the winding.

Fig. 2 illustrates the differences between the conventional coil spacers 8 and my novel coil spacers 9. It will be observed that the former are rectangular in shape whereas the latter are diamond shaped. It will also be observed that the separation of all the spacers at the outer periphery of the coil section 3 is the same. As previously stated, the maximum amount of this separation is usually dictated by the mechanical strength of the material comprising the coil sections. However, by reason of the shape of my improved spacers 9, in which adjacent edges are substantially parallel with each other instead of extending radially outward from the center or axis of the windings as in the case with the spacers 8, the separation of the adjacent spacers 9 at the inner periphery of the coil is the same as at the outer periphery of the coil and is substantially greater than the separation of adjacent spacers 8 at the inner periphery of the coil. This, therefore, provides a substantially increased circumferential space between the 3 cylinder 6 and the coil for accommodating the tap leads H.

For purposes of comparison, Fig. 3 shows that if conventional spacers 8 were substituted for the spacers 9 in Fig. 2, the unsupported arc length X at the outer periphery of the coil section would be substantially increased beyond the corresponding distance for the other adjacent spacers 8, if the two spacers 8 which have been substituted for the spacers 9 were separated suiiiciently to provide an arc length Y at the inner periphery of the coil equal to that shown in Fig. 2 between the coil spacers 9 and which is necessary for accommodating the leads ll.

While there has been shown and described a particular embodiment of the invention, it will be obvious to those skilled in the art that changes and modfications can be made without departing from the true spirit and scope of the invention and therefore it is aimed in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. Electrical induction apparatus comprising, in combination, a circular insulating cylinder, a plurality of flat lcircular coil sections on said cylinder, a plurality of spacing rods between said cylinder and said coil sections, a plurality of equally circumferentially separated coil section spacers attached respectively to said rods and extending radially outward from said cylinder between said coil sections, and a pair of adjacent coil section spacers extending outwardly from said cylinder between said coil sections, the outer circumferential spacing of said pair of spacers being the same as for the other spacers, said pair of spacers being substantially parallel to each other so as to increase the inner circumferential separation between them over what it would be if they both extended radially outward from said cylinder, said spacers being attached to said rods.

2. In an electrical induction apparatus, a pair of coaxial circular coil sections, more than two radially extending spacers between said coil sections, said spacers being separated by substantially equal arc lengths around the outside of said coil sections, two adjacent ones of said spacers being substantially diamond shaped in outline, one pair of opposite sides of each of said last mentioned spacers being substantially tangent to the circular curvature of said coil sections, the remaining sides of said last mentioned spacers all being substantially parallel with a radius of said coil sections which passes midway between said spacers so that the inner and outer circular arc lengths of said coils between said spacers are substantially equal, and retaining means for said spacers.

OLIVER H. BEYMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 974,167 Mayer Nov. 1, 1910 1,255,947 Thordarson Feb. 12, 1918 1,338,884 Thordarson May 4, 1920 1,624,896 Veitch Apr. 12, 1927 

